SEG Technical Program Expanded Abstracts 2008 2008
DOI: 10.1190/1.3059158
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HEM calibration and bird‐swing correction: An insular example

Abstract: All helicopter electromagnetic data exhibit effects of bird pendulum. In addition, historic Helicopter EM data are on occasion severely miscalibrated. If the data are not corrected for these effects, then conductivity-depth images (CDI) or inversions will likely be in error. Recently published methods of recalibration in the dimensionless amplitude-phase domain and correction for bird swing were applied to an HEM data set collected in 2002 adjacent to and over an island offshore Australia. We show major improv… Show more

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“…Accurate measurements of system geometry are not required for measuring the in-phase response with the frequency-domain systems because such systems are rigid. Efforts to improve the calibration of helicopter frequency-domain systems were shown to result in better data being derived from AEM systems (Ley- Cooper and Macnae, 2007;Macnae et al, 2008). A procedure involving a ground loop was devised by Davis and Macnae (2008a, b) to improve understanding of the time-domain waveform shape and of timing and altimeter geometry errors; that procedure also results in derivation of better fidelity information from the data.…”
Section: Other Developments In Systemsmentioning
confidence: 98%
“…Accurate measurements of system geometry are not required for measuring the in-phase response with the frequency-domain systems because such systems are rigid. Efforts to improve the calibration of helicopter frequency-domain systems were shown to result in better data being derived from AEM systems (Ley- Cooper and Macnae, 2007;Macnae et al, 2008). A procedure involving a ground loop was devised by Davis and Macnae (2008a, b) to improve understanding of the time-domain waveform shape and of timing and altimeter geometry errors; that procedure also results in derivation of better fidelity information from the data.…”
Section: Other Developments In Systemsmentioning
confidence: 98%